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1 1.10 Application of estuarine and coastal classifications in marine ...

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Sites are first classified <strong>in</strong>to one <strong>of</strong> n<strong>in</strong>e wetl<strong>and</strong> disturbance classes accord<strong>in</strong>g to a set <strong>of</strong><br />

criteria based on site conditions <strong>and</strong> disturbance types. Based on the soil type, each site is then<br />

classified as one <strong>of</strong> six restoration types that refer to the wetl<strong>and</strong> type that could be restored or<br />

enhanced. DCM classifies potential wetl<strong>and</strong> restoration <strong>and</strong> enhancement sites accord<strong>in</strong>g to the<br />

wetl<strong>and</strong> plant community types that they are likely to support once they are restored or enhanced<br />

(Figure 29). The development <strong>of</strong> the classification scheme for potential wetl<strong>and</strong> restoration <strong>and</strong><br />

enhancement sites is based on soil taxonomy, a frequency analysis <strong>of</strong> DCM’s wetl<strong>and</strong> type<br />

mapp<strong>in</strong>g results (wetl<strong>and</strong> type vs. soil mapp<strong>in</strong>g unit), l<strong>and</strong>scape position, <strong>and</strong> best pr<strong>of</strong>essional<br />

judgment from wetl<strong>and</strong> scientists <strong>and</strong> soil scientists.<br />

<strong>1.10</strong>.10.2 Identify<strong>in</strong>g <strong>and</strong> Prioritiz<strong>in</strong>g Restoration Sites <strong>in</strong> Puget Sound, Oregon USA<br />

The sub-estuaries <strong>of</strong> Puget Sound have lost more than 80% <strong>of</strong> tidal marsh habitats <strong>in</strong><br />

the past 150 years <strong>and</strong> efforts are underway to restore priority areas. Dean et al. (2000) used<br />

spatial data <strong>and</strong> GIS techniques to calculate the extent <strong>of</strong> loss <strong>in</strong> the Skagit River estuary <strong>and</strong><br />

to identify <strong>and</strong> rank areas that would be appropriate for restor<strong>in</strong>g <strong>estuar<strong>in</strong>e</strong> habitat for the<br />

benefit <strong>of</strong> ch<strong>in</strong>ook salmon (Oncorhynchus tshawytscha) <strong>and</strong> other threatened or endangered<br />

species. Selection criteria were based on ecologically mean<strong>in</strong>gful characteristics <strong>of</strong> the<br />

l<strong>and</strong>scape (follow<strong>in</strong>g Shreffler <strong>and</strong> Thom 1993), balanced with criteria rank<strong>in</strong>g ease <strong>of</strong><br />

restoration. L<strong>and</strong>scape variables <strong>in</strong>cluded areas <strong>of</strong> tidal <strong>and</strong> seasonal flood<strong>in</strong>g, hydrological<br />

connectivity <strong>and</strong> ecological susta<strong>in</strong>ability with the f<strong>in</strong>al site prioritization classification<br />

developed with a tally <strong>of</strong> scores from each criterion (i.e., 0= outside flood corridor; 4=<br />

<strong>in</strong>side flood corridor). Hydrology was the basis for classify<strong>in</strong>g connectivity <strong>and</strong> this was<br />

62

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